Originally I just wanted to add essential things that I felt were missing in MC, then I made things compatible, then I wanted to fix things that were just inconsistent, and then that ended up in me practically re-doing everything that already exists in a better way because everyone’s shit was broken as fuck, then I ditched GT5 for the same reason of being massively broken and started GT6.

Oh just forgot to tell about my meeting with GT;
My first version of GT was a GT3 on minecraft 1.5.2; I was young and a bit silly so I made “mod pack” myself, I just put there all mods what I could found. There was a GT too. I just played it in creative mod. Then 6(maybe) years passed and I visited “steamlynx” on YouTube, I heared about Ideal Industrial Assembly with GT5 and so I started playing it in survavial, some time latter I wanted to help it’s developers so I learned java a bit and start coding, so I’m here =)

I was in the 4th grade maybe, and searching through packs on the FTB launcher. I found FTB Resurrection and tried it out. I saw that this mod named “GregTech” changed a lot of the recipes and added a lot of stuff, so I took a look into it and found out more. I spent a couple days grinding the BBF and found out that the EBF was a thing, so I basically ragequit after that, lol. Skip a couple years and I felt like revisiting that mod that made me ragequit and found out about GT5u in 2016 and saw Bear play with GT6. I played with GT6 and it was too much for me at the time, so i stuck with GT5u. I later went back to GT6 and found it much more enjoyable after Greg added some quality of life features. I started working on my addon and i’ve been loving it ever since

Hmm… The very first time was in 2013, when GT was more like an addon to IC and didn’t yet override pretty much an entire game :D. I remember it added the multiblocks Blast Furnace and the Grinder, and also the Chemical Processor that was a real pain for me to automate :).
On the next server there was GT5, but everyone on the server had avoided most of its changes - Steam was stored in a tank and was produced by solar mirrors… Although, as I remember, I was astounded by the recipes for Assembler and Mixer (I needed both of those to make a cake for Botania). At that time, everyone else on the server was getting really annoyed by the massive alterations, and decided to remove GT from next servers.
However, I was really curious about GT6, especially about the long progression and metal-smelting, and so I decided to start a solo-world, limiting myself to using just GT for everything, apart from cosmetics and some QoL features of other mods (like bags from Forestry). And so… Fast-forward 1.5 years, I’m still actively playing!